It's not mentioned in this article, but the man in question has a long history of burglary and did four years for a string of thefts. It's likely a big part of why HIM carrying a 6'' blade is concerning.
Bray subsequently claimed the Master Sword was a “fidget” — something to keep his hands busy — that he had bought online. But police said that because it was a sharply pointed item, it could be used as a weapon, and “put others in fear of it being used against them.” The police said the Master Sword was inside a sheath and could be released with the press of a button.
So I guess the 6-inch master sword isn't covered by the 2nd amendment in public. Geez, you'd think the forefathers would have foreseen something so obvious.